Currently only smoke density of diesel vehicles is measured which is not enough to get a fair measure of the pollution, the Tribunal has said.
The National Green Tribunal has asked for stricter norms to check pollution in Delhi especially from diesel vehicles.
Currently only smoke density is measured from diesel vehicles as a measure of checking pollution.
Calling the measure "not enough", the green court sought more stringent norms as well as individual parameters checked including the checking of sulphur-dioxide in the exhaust.
The Tribunal has directed the Union environment ministry, the Delhi Pollution Control Committee and the Central Pollution Control Board to inform it of steps to impose stricter emission norms.
The Delhi government admitted that there are no pollution checking facilities at six of the 13 major entry points into the national capital which has among the worst levels of air pollution worldwide.
The court has also asked the traffic police to inform it about alternate routes for all traffic which is not bound for the capital.